Mail delivery failed: returning message to sender

[Mail Delivery System]

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  balini na vseznam.cz
    SMTP error from remote mail server after RCPT TO:<balini na vseznam.cz>:
    host mail.endora.cz [88.86.120.229]: 550-rejected because 62.36.20.214 is in a black list at b.barracudacentral.org
    550 http://www.barracudanetworks.com/reputation/?pr=1&ip=62.36.20.214
  kapr na cz.seznam.cz
    Unrouteable address